Synapse

Synapse is the "New Continent" that Sugata has been searching for and found out that it's connected to Tomoki's dream. The only way for them to enter Synapse though, is through the Dive Game. Sugata finds that some people on earth are not "real", but in fact are just angels inside pods "dreaming" and that it is where the Angeloids had been developed.

The Synapse first appears as a grassy field through Tomoki's dreams. However, later when Sugata keeps re-entering, it's revealed that Synapse is divided into separate "islands", some islands are organic while others are not. The land has been here for Eons. The exact size of Synapse in unknown. What is shown is that the dimension houses a star. Nymph in Pandora Form, who was at least light speed, took minutes traveling though Synapse to make her way to Zeus. Which means Synapse is massively bigger than Earth. The angels that live there created the Big Bang. According to Hiyori in My Eternal Master, Synapse created and rule over multiple timelines of parallel universes and universes of different time axis in the Hyper-Dimension.

Tomoki, Sohara, Sugata, and Mikako visited an island with a single large structure with writings on it. In Chapter 72 of the manga, it was revealed that the scrawling marks, are the wishes of every Angel from Synapse, all wishing for a new world. This structure (named "The Rule") can grant any wish to any non-Angeloid who uses it.

Aside from Tomoki's dream, the only other way to reach Synapse is to fly there through the entry portal. However, any intruders in Synapse airspace will come under attack by a specialized, anti-air defense system, "Zeus."

The mass-fabricated Medical Specialist Angeloids clean and maintain Synapse. These Angeloids are closer to what humans call robots than to an Angeloid (according to Nymph). These Angeloids are made for maintaining the city for when the people of Synapse are dreaming.